FPGATrackSimLogicalEventInputHeader Node1 FPGATrackSimLogicalEvent InputHeader - m_event - m_optional - m_towers + FPGATrackSimLogicalEvent InputHeader() + ~FPGATrackSimLogicalEvent InputHeader() + reset() + newEvent() + event() + optional() + setOptional() + towers() + nTowers() + addTower() + getTower() + reserveTowers() + addTowers() Node2 TObject Node2->Node1